package com.venus.common.utils;
import java.beans.IntrospectionException;
import java.beans.Introspector;
import java.beans.PropertyDescriptor;
import java.math.BigDecimal;
import java.math.BigInteger;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.Iterator;
import java.util.List;
import java.util.Map;
import java.util.Set;

import net.sf.json.JSONArray;
import net.sf.json.JSONObject;
import net.sf.json.JsonConfig;
        
/**      
 * 处理json的工具类，负责json数据转换成java对象和java对象转换成json      
 */        
public class JsonUtil {         
        
    /**      
     * 从一个JSON 对象字符格式中得到一个java对象      
     * @param jsonString      
     * @param pojoCalss      
     * @return      
     */        
    public static Object getObject4JsonString(String jsonString, Class pojoCalss) {         
        Object pojo;         
        JSONObject jsonObject = JSONObject.fromObject(jsonString);         
        pojo = JSONObject.toBean(jsonObject, pojoCalss);         
        return pojo;         
    }         
        
    /**      
     * 从json HASH表达式中获取一个map，改map支持嵌套功能      
     * @param jsonString      
     * @return      
     */        
    public static Map getMap4Json(String jsonString) {         
        JSONObject jsonObject = JSONObject.fromObject(jsonString);         
        Iterator keyIter = jsonObject.keys();         
        String key;         
        Object value;         
        Map<String, Object> valueMap = new HashMap<String, Object>();
        while (keyIter.hasNext()) {         
            key = (String) keyIter.next();         
            value = jsonObject.get(key);         
            valueMap.put(key, value);         
        }         
        return valueMap;         
    }         
        
    /**      
     * 从json数组中得到相应java数组      
     * @param jsonString      
     * @return      
     */        
    public static Object[] getObjectArray4Json(String jsonString) {         
        JSONArray jsonArray = JSONArray.fromObject(jsonString);         
        return jsonArray.toArray();         
        
    }         
        
    /**      
     * 从json对象集合表达式中得到一个java对象列表      
     * @param jsonString      
     * @param pojoClass      
     * @return      
     */        
    public static List getList4Json(String jsonString, Class pojoClass) {         
        JSONArray jsonArray = JSONArray.fromObject(jsonString);         
        JSONObject jsonObject;         
        Object pojoValue;         
        List<Object> list = new ArrayList<Object>();         
        for (int i = 0; i < jsonArray.size(); i++) {         
            jsonObject = jsonArray.getJSONObject(i);         
            pojoValue = JSONObject.toBean(jsonObject, pojoClass);
            list.add(pojoValue);         
        }         
        return list;         
    }         
        
    /**      
     * 从json数组中解析出java字符串数组      
     * @param jsonString      
     * @return      
     */        
    public static String[] getStringArray4Json(String jsonString) {         
        JSONArray jsonArray = JSONArray.fromObject(jsonString);         
        String[] stringArray = new String[jsonArray.size()];         
        for (int i = 0; i < jsonArray.size(); i++) {         
            stringArray[i] = jsonArray.getString(i);         
        }         
        return stringArray;         
    }         
        
    /**      
     * 从json数组中解析出javaLong型对象数组      
     * @param jsonString      
     * @return      
     */        
    public static Long[] getLongArray4Json(String jsonString) {         
        JSONArray jsonArray = JSONArray.fromObject(jsonString);         
        Long[] longArray = new Long[jsonArray.size()];         
        for (int i = 0; i < jsonArray.size(); i++) {         
            longArray[i] = jsonArray.getLong(i);         
        }         
        return longArray;         
    }         
        
    /**      
     * 从json数组中解析出java Integer型对象数组      
     * @param jsonString      
     * @return      
     */        
    public static Integer[] getIntegerArray4Json(String jsonString) {         
        JSONArray jsonArray = JSONArray.fromObject(jsonString);         
        Integer[] integerArray = new Integer[jsonArray.size()];         
        for (int i = 0; i < jsonArray.size(); i++) {         
            integerArray[i] = jsonArray.getInt(i);         
        }         
        return integerArray;         
    }         
                
    /**      
     * 从json数组中解析出java Integer型对象数组      
     * @param jsonString      
     * @return      
     */        
    public static Double[] getDoubleArray4Json(String jsonString) {         
        JSONArray jsonArray = JSONArray.fromObject(jsonString);         
        Double[] doubleArray = new Double[jsonArray.size()];         
        for (int i = 0; i < jsonArray.size(); i++) {         
            doubleArray[i] = jsonArray.getDouble(i);         
        }         
        return doubleArray;         
    }         
        
        
    /**      
     * 将java对象转换成json字符串      
     * @param javaObj      
     * @return      
     */        
    public static String getJsonString4JavaPOJO(Object javaObj) {         
        JSONObject json;         
        json = JSONObject.fromObject(javaObj);         
        return json.toString();         
    }   
    
    /**      
     * 将java对象转换成json字符串,过滤不需要的字段
     * @param javaObj      
     * @return      
     */        
    public static String getJsonString4JavaPOJO(Object obj, String[] strExcludes) {         
    	JsonConfig config = new JsonConfig(); 
    	config.setIgnoreDefaultExcludes(false); 
    	config.setExcludes(strExcludes);
    	JSONObject json = JSONObject.fromObject(obj, config);
        return json.toString();
    }  
    
    public static String getJsonString4List(List lstObjects, String[] strExcludes){ 
        StringBuffer sb = new StringBuffer(128);
        sb.append("[");
        for(int i=0;i<lstObjects.size();i++){
        	if(strExcludes!=null && strExcludes.length>0){
        		sb.append(getJsonString4JavaPOJO(lstObjects.get(i), strExcludes));
        	}else{
        		sb.append(getJsonString4JavaPOJO(lstObjects.get(i)));
        	}
        	if(i != lstObjects.size()-1){
        		sb.append(",");
        	}
        }
       sb.append("]");
       return sb.toString();
    } 
    
    /**
     * @param obj 任意对象
     * @return String
     */
    public static String object2json(Object obj) {
        StringBuilder json = new StringBuilder();
        if (obj == null) {
            json.append("\"\"");
        } else if (obj instanceof String || obj instanceof Integer || obj instanceof Float || obj instanceof Boolean
                || obj instanceof Short || obj instanceof Double || obj instanceof Long || obj instanceof BigDecimal
                || obj instanceof BigInteger || obj instanceof Byte) {
            json.append("\"").append(string2json(obj.toString())).append("\"");
        } else if (obj instanceof Object[]) {
            json.append(array2json((Object[]) obj));
        } else if (obj instanceof List) {
            json.append(list2json((List<?>) obj));
        } else if (obj instanceof Map) {
            json.append(map2json((Map<?, ?>) obj));
        } else if (obj instanceof Set) {
            json.append(set2json((Set<?>) obj));
        } else {
            json.append(bean2json(obj));
        }
        return json.toString();
    }
    
    /**
     * @param bean bean对象
     * @return String
     */
    public static String bean2json(Object bean) {
        StringBuilder json = new StringBuilder();
        json.append("{");
        PropertyDescriptor[] props = null;
        try {
            props = Introspector.getBeanInfo(bean.getClass(), Object.class).getPropertyDescriptors();
        } catch (IntrospectionException e) {
        }
        if (props != null) {
            for (int i = 0; i < props.length; i++) {
                try {
                    String name = object2json(props[i].getName());
                    String value = object2json(props[i].getReadMethod().invoke(bean));
                    json.append(name);
                    json.append(":");
                    json.append(value);
                    json.append(",");
                } catch (Exception e) {
                	e.printStackTrace();
                }
            }
            json.setCharAt(json.length() - 1, '}');
        } else {
            json.append("}");
        }
        return json.toString();
    }
    /**
     * @param list list对象
     * @return String
     */
    public static String list2json(List<?> list) {
        StringBuilder json = new StringBuilder();
        json.append("[");
        if (list != null && list.size() > 0) {
            for (Object obj : list) {
                json.append(object2json(obj));
                json.append(",");
            }
            json.setCharAt(json.length() - 1, ']');
        } else {
            json.append("]");
        }
        return json.toString();
    }
    
    /**
     * @param array 对象数组
     * @return String
     */
    public static String array2json(Object[] array) {
        StringBuilder json = new StringBuilder();
        json.append("[");
        if (array != null && array.length > 0) {
            for (Object obj : array) {
                json.append(object2json(obj));
                json.append(",");
            }
            json.setCharAt(json.length() - 1, ']');
        } else {
            json.append("]");
        }
        return json.toString();
    }
    
    /**
     * @param map map对象
     * @return String
     */
    public static String map2json(Map<?, ?> map) {
        StringBuilder json = new StringBuilder();
        json.append("{");
        if (map != null && map.size() > 0) {
            for (Object key : map.keySet()) {
                json.append(object2json(key));
                json.append(":");
                json.append(object2json(map.get(key)));
                json.append(",");
            }
            json.setCharAt(json.length() - 1, '}');
        } else {
            json.append("}");
        }
        return json.toString();
    }
    
    /**
     * @param set 集合对象
     * @return String
     */
    public static String set2json(Set<?> set) {
        StringBuilder json = new StringBuilder();
        json.append("[");
        if (set != null && set.size() > 0) {
            for (Object obj : set) {
                json.append(object2json(obj));
                json.append(",");
            }
            json.setCharAt(json.length() - 1, ']');
        } else {
            json.append("]");
        }
        return json.toString();
    }
    
    /**
     * @param s 参数
     * @return String
     */
    public static String string2json(String s) {
        if (s == null)
            return "";
        StringBuilder sb = new StringBuilder();
        for (int i = 0; i < s.length(); i++) {
            char ch = s.charAt(i);
            switch (ch) {
            case '"':
                sb.append("\\\"");
                break;
            case '\\':
                sb.append("\\\\");
                break;
            case '\b':
                sb.append("\\b");
                break;
            case '\f':
                sb.append("\\f");
                break;
            case '\n':
                sb.append("\\n");
                break;
            case '\r':
                sb.append("\\r");
                break;
            case '\t':
                sb.append("\\t");
                break;
            case '/':
                sb.append("\\/");
                break;
            default:
                if (ch >= '\u0000' && ch <= '\u001F') {
                    String ss = Integer.toHexString(ch);
                    sb.append("\\u");
                    for (int k = 0; k < 4 - ss.length(); k++) {
                        sb.append('0');
                    }
                    sb.append(ss.toUpperCase());
                } else {
                    sb.append(ch);
                }
            }
        }
        return sb.toString();
    }
      
}    
